1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Format of an ARP firewall descriptor 4 * 5 * src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in 6 * network byte order. 7 * flags are stored in host byte order (of course). 8 */ 9#ifndef _ARPTABLES_H 10#define _ARPTABLES_H 11 12#include <linux/if.h> 13#include <linux/in.h> 14#include <linux/if_arp.h> 15#include <linux/skbuff.h> 16#include <uapi/linux/netfilter_arp/arp_tables.h> 17 18/* Standard entry. */ 19struct arpt_standard { 20 struct arpt_entry entry; 21 struct xt_standard_target target; 22}; 23 24struct arpt_error { 25 struct arpt_entry entry; 26 struct xt_error_target target; 27}; 28 29#define ARPT_ENTRY_INIT(__size) \ 30{ \ 31 .target_offset = sizeof(struct arpt_entry), \ 32 .next_offset = (__size), \ 33} 34 35#define ARPT_STANDARD_INIT(__verdict) \ 36{ \ 37 .entry = ARPT_ENTRY_INIT(sizeof(struct arpt_standard)), \ 38 .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ 39 sizeof(struct xt_standard_target)), \ 40 .target.verdict = -(__verdict) - 1, \ 41} 42 43#define ARPT_ERROR_INIT \ 44{ \ 45 .entry = ARPT_ENTRY_INIT(sizeof(struct arpt_error)), \ 46 .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ 47 sizeof(struct xt_error_target)), \ 48 .target.errorname = "ERROR", \ 49} 50 51extern void *arpt_alloc_initial_table(const struct xt_table *); 52int arpt_register_table(struct net *net, const struct xt_table *table, 53 const struct arpt_replace *repl, 54 const struct nf_hook_ops *ops); 55void arpt_unregister_table(struct net *net, const char *name); 56void arpt_unregister_table_pre_exit(struct net *net, const char *name); 57extern unsigned int arpt_do_table(void *priv, struct sk_buff *skb, 58 const struct nf_hook_state *state); 59 60#ifdef CONFIG_NETFILTER_XTABLES_COMPAT 61#include <net/compat.h> 62 63struct compat_arpt_entry { 64 struct arpt_arp arp; 65 __u16 target_offset; 66 __u16 next_offset; 67 compat_uint_t comefrom; 68 struct compat_xt_counters counters; 69 unsigned char elems[]; 70}; 71 72static inline struct xt_entry_target * 73compat_arpt_get_target(struct compat_arpt_entry *e) 74{ 75 return (void *)e + e->target_offset; 76} 77 78#endif /* CONFIG_COMPAT */ 79#endif /* _ARPTABLES_H */ 80